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<p>注释是一种代码内文档。当被插入到程序中时，它们实际上会被编译器忽略；它们仅作为笔记被阅读源代码的人使用。虽然具体的文档并不是 C++ 标准的一部分，但存在一些工具可以使用不同的文档格式解析注释。
</p>
<h3><span class="mw-headline" id=".E8.AF.AD.E6.B3.95">语法</span></h3>
<table class="t-sdsc-begin">

<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <code><b>/*</b></code> <span class="t-spar">注释</span> <code><b>*/</b></code>
</td>
<td> (1)
</td>
<td class="t-sdsc-nopad">
</td></tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <code><b>//</b></code> <span class="t-spar">注释</span>
</td>
<td> (2)
</td>
<td class="t-sdsc-nopad">
</td></tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr></table>
<div class="t-li1"><span class="t-li">1)</span> 通称为“ C 风格”或“多行”注释。</div>
<div class="t-li1"><span class="t-li">2)</span> 通称为“ C++ 风格”或“单行”注释。</div>
<p>在<a href="language/translation_phases.html" title="cpp/language/translation phases">翻译阶段 3</a>中，通过把每段注释替换为单个空白字符，所有的注释都从程序中被移除。
</p>
<h3><span class="mw-headline" id="C_.E9.A3.8E.E6.A0.BC">C 风格</span></h3>
<p>C 风格注释通常用于注释大块的文本；不过也可以用它们注释单行文本。要插入一个 C 风格注释，可以简单地以 <code>/*</code> 和 <code>*/</code> 环绕文本；这样会使注释的内容被编译器忽略。尽管不是 C++ 标准的一部分， <code>/**</code> 和 <code>*/</code> 常用于指示文档块；这是合法的，因为第二个星号简单地被当做注释的一部分。C风格注释不能被嵌套。
</p>
<h3><span class="mw-headline" id="C.2B.2B_.E9.A3.8E.E6.A0.BC">C++ 风格</span></h3>
<p>C++ 风格注释通常用于注释单行文本；不过也可以把多个 C++ 风格注释放在一起来组成多行注释。 C++ 风格注释告诉编译器忽略 <code>//</code> 和换行符之间的所有内容。
</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
<p>因为注释在预处理器阶段前已经<a href="language/translation_phases.html" title="cpp/language/translation phases">被移除</a>，所以宏不能用于组成注释，而且未终止的 C 风格注释不会从被 #include 的文件中漏出。
</p><p>除了把代码注释掉之外，用于排除源代码的其他机制还有：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#if 0</span>
    <a href="io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"这一句不会被执行（甚至不会被编译）<span class="es1">\n</span>"</span><span class="sy4">;</span>
<span class="co2">#endif</span></pre></div></div>
<p>以及
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="kw1">if</span><span class="br0">(</span><span class="kw2">false</span><span class="br0">)</span> <span class="br0">{</span>
    <a href="io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"这一句不会被执行<span class="es1">\n</span>"</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="coMULTI">/* C 风格注释
能含有多行 */</span>
<span class="coMULTI">/* 或仅一行 */</span>
 
<span class="coMULTI">/**************
 *  你能插入任何 * ，但
 *  你不能使注释嵌套
 */</span>
 
<span class="co1">// C++ 风格注释能注释一行</span>
 
<span class="co1">// 或者，能将</span>
<span class="co1">// 它们串在一起</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
  <span class="co1">// 注释在预处理前被移除，</span>
  <span class="co1">// 故 ABC 为 1 ，非 1//2134 ，而 "1 hello world"</span>
  <span class="co1">// 将得以打印</span>
<span class="co2">#define ABC 1//2134</span>
  <a href="io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> ABC <span class="sy1">&lt;&lt;</span> <span class="st0">" hello world<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
  <span class="co1">// 将不运行下方代码</span>
  <span class="co1">// return 1;</span>
 
  <span class="co1">// 将运行下方代码</span>
  <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">1 hello world</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

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